"""插件实例列举在独占事务下的结果物化测试。"""

from __future__ import annotations

import pytest
from sqlalchemy import delete
from sqlalchemy.orm import Session

from app.db.models.plugininstance import PluginInstance
from app.db.oper.plugininstance import PluginInstanceOper
from app.db.uow import run_sync_transaction

_INSTANCE_IDS = ("DemoPlugin", "DemoPlugin@clone1", "OtherPlugin@clone1")


@pytest.fixture(autouse=True)
def purge_written_rows():
    """删除用例写入的行，测试库在整个会话内共享，残留会干扰后续用例。"""
    yield

    def purge(session: Session) -> None:
        """按本文件使用的固定标识精确删除，不触碰其他用例的数据。"""
        session.execute(
            delete(PluginInstance).where(
                PluginInstance.instance_id.in_(_INSTANCE_IDS)
            )
        )

    run_sync_transaction(purge)


def test_list_all_materializes_rows_before_session_close():
    """表中有记录时 list_all 必须返回已物化的实例，而不是关闭会话后的游标。"""
    oper = PluginInstanceOper()
    oper.save(instance_id="DemoPlugin", source_plugin_id="DemoPlugin")
    oper.save(instance_id="DemoPlugin@clone1", source_plugin_id="DemoPlugin")

    records = oper.list_all()

    assert {record.instance_id for record in records} >= {
        "DemoPlugin",
        "DemoPlugin@clone1",
    }


def test_list_by_source_materializes_rows_before_session_close():
    """按源插件列举同样要在会话关闭前取完行。"""
    oper = PluginInstanceOper()
    oper.save(instance_id="OtherPlugin@clone1", source_plugin_id="OtherPlugin")

    records = oper.list_by_source("OtherPlugin")

    assert [record.instance_id for record in records] == ["OtherPlugin@clone1"]


def test_save_rejects_flipping_an_existing_row_between_virtual_and_host():
    """分身与本体互不转换，改写已存在行的归属必须在持久化层被拒绝。

    角色由 instance_id 是否等于 source_plugin_id 派生，把归属改成实例 ID 自身正是
    把一个分身就地变成本体，只可能来自调用方错把分身实例 ID 当作源插件 ID 使用。
    """
    oper = PluginInstanceOper()
    oper.save(instance_id="DemoPlugin@clone1", source_plugin_id="DemoPlugin")

    with pytest.raises(ValueError):
        oper.save(
            instance_id="DemoPlugin@clone1",
            source_plugin_id="DemoPlugin@clone1",
        )

    preserved = oper.get("DemoPlugin@clone1")
    assert preserved is not None
    assert preserved.is_host is False
    assert preserved.source_plugin_id == "DemoPlugin"